Question about 1991 Ford F150

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High Idle My 1991 Ford F150 idles extreme high sometimes and the check engine light comes on. If I turn the engine off while this is happening I can't get it started again and have to have it jumped. For awhile I was removing one of the battery terminals which seemed to help. I would be able to start it without the jump. Why would it be idling so high and would it affect the battery? Thanks Beth

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Get a code reader like the Actron CP9015 Code Scanner, for 20 dollars and follow the directions. count the flashes and post the code if you need further help

Posted on Nov 28, 2008

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I have 1990 ford f150 5.8 liter it idles high when in park and idles about 1200 rpm when in gear and sometimes surges up and down. i have clean the idle control and check showing 12.5 ohms still won&#


One common problem is a vac leak or a sticking throttle plate.
The computer controls idle speed by how much air is allowed into the intake. The idle control valve could be sticking even tho you have cleaned it, or have a faulty motor.

Sep 12, 2012 | 1990 Ford F150

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82 F150, fuel injection, 5.0 RPM's go high and idles high, happens when driving, when you stop and put in park or nuetral will die. found when we had very slight dusting of snow on the street, could not...


i would first check the idle position sensor,located where the throttle cable ends at the tbi. check for broken wires or hoses, try un-plugging and see if the problem goes away. get back to me if you need more help. please rate my fix. Thanks Ray

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1 Answer

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try un-plugging the IAC motor,then start it,if it idles low and stays there then replace the IAC motor----if no change then you may have a knock in the engine and the knock sensor is telling the computer to change the timing to compensate for spark knock due to low grade fuel,so it advances the timing back and forth due to too high of rpm then too low and the computer doesnt know how to smoothen it out that fast,but eventually does.The check engine light would usually come on in this case

Jan 23, 2010 | Ford F-150 Cars & Trucks

1 Answer

2002 ford ranger has engine light on. when i come to a stop the engine idle is high sometimes low to were the truck turns off. Runs good on the road.


Inspect / replace the idle sensor.
This is not an advertisement:
Take your vehicle to AutoZone for a free "check engine light' analysis and ask for an explanation print-out. Have them reset the PCM (check engine light).
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1 Answer

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1 Answer

ENGINE SURGES AT IDLE


with the engine running lift hood and lisen for a vacum leak and check all your vacum lines. if no vacum leak can be found then replace the idle air control valve.

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1 Answer

2001 FORD F150 ENGINE SURGES AND DIES AT IDLE


Check all of your vacume lines. If it isn't a vacume line it is most likely the O2 sensor.

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